l677eg.m77t - MGD77 data file for Geophysical data from field activity L-6-77-EG in Eastern Gulf of Alaska from 06/13/1977 to 06/30/1977

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Frequently anticipated questions:


What does this data set describe?

Title:
l677eg.m77t - MGD77 data file for Geophysical data from field activity L-6-77-EG in Eastern Gulf of Alaska from 06/13/1977 to 06/30/1977
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-6-77-EG in Eastern Gulf of Alaska from 06/13/1977 to 06/30/1977, http://walrus.wr.usgs.gov/infobank/l/l677eg/html/l-6-77-eg.meta.html These data are reformatted from space-delimited ASCII text files located in the Coastal and Marine Geology Program (CMGP) InfoBank field activity catalog at http://walrus.wr.usgs.gov/infobank/l/l677eg/html/l-6-77-eg.bath.html, http://walrus.wr.usgs.gov/infobank/l/l677eg/html/l-6-77-eg.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l677eg/html/l-6-77-eg.mag.html into MGD77T format provided by the NOAA's National Geophysical Data Center(NGDC). The MGD77T format includes a header (documentation) file (.h77t) and a data file (.m77t). More information regarding this format can be found in the publication listed in the Cross_reference section of this metadata file.
Supplemental_Information:
The navigation data are digitally collected using a Satellite Integrated Navigation (SINS) system. The system is a space-based satellite navigation maintained by the United States government and is accessible using a satellite receiver. This system provides navigational accuracy of approximately 200 m.The Data Acquistion, Processing, and Storage (DAPS) group performs a number of processing steps to the navigation data once it is collected which can vary by cruise. These steps are outlined within the header information in each individual digital navigation (.05x) space-delimited ASCII data file. The header information rows are indicated by lines beginning with the character "!". There is no information on how the single-beam bathymetry, gravity, and magnetic data were collected. For each data gathering cruise leg, the available data in the following categories are forwarded to NGDC: navigation, gravity, magnetics, bathymetry, and seismic shot points. The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpolated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC.
  1. How might this data set be cited?
    U.S. Geological Survey, and Coastal and Marine Geology Program, 2013, l677eg.m77t - MGD77 data file for Geophysical data from field activity L-6-77-EG in Eastern Gulf of Alaska from 06/13/1977 to 06/30/1977: U.S. Geological Survey, Menlo Park, CA.

    Online Links:

    This is part of the following larger work.

    Steele, Wm. Clinton, Degnan, Carolyn H., Deeter, Gary B., and Riordan, Jean A., 1980, DESCRIPTION OF MARINE GEOPHYSICAL DATA COLLECTED BY THE U.S. GEOLOGICAL SURVEY AND HOW TO OBTAIN IT: U.S. Geological Survey Open File Report 167, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -151.81000
    East_Bounding_Coordinate: -131.62680
    North_Bounding_Coordinate: 60.11625
    South_Bounding_Coordinate: 54.62029
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 13-Jun-1977
    Ending_Date: 30-Jun-1977
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tab-delimited ASCII text files
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference: Eastern Gulf of Alaska
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.25722210100002.
  7. How does the data set describe geographic features?
    l677eg.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for L677EG (Source: NOAA's National Geophysical Data Center, See Hittelman and others (2010) Cross_Reference section above for details about the MGD77T format and citation information.)
    SURVEY_ID
    Survey identifier supplied by the contributing organization (Source: NGDC) This identifier varies in format and is supplied by the contributing organization
    TIMEZONE
    Time-zone correction (Source: NGDC) In our datasets, no correction was applied. All values equal 0.
    DATE
    YYYYMMDD (Source: NGDC)
    Range of values
    Minimum:19770613
    Maximum:19770630
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.866
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:54.62033
    Maximum:60.11619
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-151.81000
    Maximum:-131.626808
    Units:decimal degrees
    POS_TYPE
    Indicates how lat/lon was obtained (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:3
    Units:1 = observed fix, 3 = interpolated fix, nil = unspecified
    BAT_TTIME
    Bathymetry, 2-way travel time (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.03
    Maximum:6.296
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:22.5
    Maximum:4718
    Units:decimal meters
    BAT_CPCO
    Bathymetric Correction code - details the procedure used for determining the sound velocity correction to depth (Source: NGDC)
    Range of values
    Minimum:63
    Maximum:63
    Units:01-55 Matthews' Zones with zone , 59 Matthews' Zones, no zone specified, 60 S. Kuwahara Formula, 61 Wilson Formula, 62 Del Grosso Formula, 63 Carter's Tables, 88 Other (see Add. Doc.), 97 Computed using 1500 meters/sec, 98 Unknown if Corrected, 99 Unspecified
    BAT_TYPCO
    Bathymetry type code - indicates how the bathymetric value was obtained (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:3
    Units:1 - Observed, 3 - Interpolated (Header Seq. 12), 9 - Unspecified
    MAG_TOT
    Magnetics total field - 1st sensor (Source: NGDC)
    Range of values
    Minimum:55774
    Maximum:58835
    Units:gammas
    MAG_TOT2
    Magnetics total field - 2nd sensor (Source: NGDC)
    Range of values
    Minimum:53741.7
    Maximum:58789.5
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-467.1
    Maximum:1911.8
    Units:gammas
    MAG_RESSEN
    SENSOR FOR RESIDUAL FIELD (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:1
    Units:1 - first sensor, 2 - second sensor, 9 - Unspecified
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:981467.2
    Maximum:981952.7
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-41.7
    Maximum:20.3
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-90.3
    Maximum:137.3
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:950
    Units:Used, for example, to cross reference with seismic data.
    POINTID
    SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)
    Range of values
    Minimum:44
    Maximum:1768
    Units:Used, for example, to cross reference with seismic data.
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L677EG in MGD77T format.
    Entity_and_Attribute_Detail_Citation:
    Attributes are obtained from MGD77T data files created from the navigation and bathymetry best files. MGD77T is the standard, defined data format used for geophysical data in the National Geophysical Data Center. See Cross_Reference section above for citation details.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
    • Coastal and Marine Geology Program
  2. Who also contributed to the data set?
    Terry Bruns (Chief Scientist)
  3. To whom should users address questions about the data?
    Gregory K. Miller
    U.S. Geological Survey
    Physical Scientist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747, ext. 3020 (voice)
    gmiller@usgs.gov

Why was the data set created?

These data and information are intended for science researchers,students, policy makers, and general public. These data are not to be used for navigation purposes. The data are reformatted into MGD77T standard format for inclusion into NOAA's NGDC geophysical database. From there the data will be made available to GeoMapApp ( http://www.geomapapp.org/ ) and Virtual Ocean ( http://www.virtualocean.org/ ) Earth-browsing software. Access to the data is also provided via the USGS Coastal and Marine Geoscience Data System ( http://cmgds.marine.usgs.gov/ ).

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 19-Jan-1996 (process 1 of 6)
    Navigation Data >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L677EG.N]L677EG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Oct-1998 (process 2 of 6)
    Gravity Data >10/31/1998 /tiger/l/l677eg/grav/l-6-77-eg.165_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/02/86 CLINT DUA0:[DATA.L677EG]L677EG.165; >DRB0:[CLINT]REFMTJCGRV.EXE; >reformatted from JChilds file l677eg.edit_grv > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L677EG.N]L677EG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 21-Jun-2012 (process 3 of 6)
    Magnetics Data >06/21/2012 carolyn l-6-77-eg.260_010 > >Reprocessed using subroutines from Susan Macmillan's >IGRF SYNTHESIS PROGRAM http://www.ngdc.noaa.gov/IAGA/vmod/igrf11.f >with IGRF-11 coeffiecients integrated into the source code. >/infobank/programs/mag/magred11/magred11.for >Using geodetic coordinate system (Earth shape approximated by spheriod) >with altitude 0.0 km (for sea level). > >Input was... >10/31/1998 /tiger/l/l677eg/mag/l-6-77-eg.240_010 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/03/86 CAROLYN DRS$DATA:[L677EG.M]L677EG.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >reformatted from L677EG.200 from Barb >175/0522-176/1755 was F.2 from Clint > >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L677EG.N]L677EG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Oct-1998 (process 4 of 6)
    Bathymetry Data >10/31/1998 /tiger/l/l677eg/bath/l-6-77-eg.335_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >01/22/86 BECKIE DISK$USERDISK:[BECKIE.BAT360]L677EG.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >I think this file is hand-digetized bathymetry in >2-way traveltime(secs), at least until time (178/18123000). >After this time the file seems to have been digetized in >meters at 15 minute intervals. The reduction conversion >was from seconds to meters until 17818123000, and meters to >seconds after that using no Matthews correction and an >assumed speed of sound of 1500m/sec. > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L677EG.N]L677EG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 20-Jun-2012 (process 5 of 6)
    MGD77 file creation - The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpolated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC. Person who carried out this activity:
    U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 01-Feb-2017 (process 6 of 6)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
  3. What similar or related data should the user be aware of?
    Hittelman, Allen M., Groman, Robert C., Haworth, Richard T., Holcombe, Troy L., McHendrie, Graig, Smith, Stuart M., and Metzger, Dan R., 2010, The marine geophysical data exchange format - MGD77 / MGD77T: National Geophysical Data Center, National Oceanic and Atmospheric Administration, Boulder, CO.

    Online Links:

    Other_Citation_Details: 25 p.

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    The validity or accuracy of bathymetry and navigation data is highly qualitative and depends on equipment and operating condition variables. Data quality is unknown, MGD77T files were formatted from InfoBank files identified as best available version.
  2. How accurate are the geographic locations?
    Unspecified
  3. How accurate are the heights or depths?
    Unspecified
  4. Where are the gaps in the data? What is missing?
    Start and end date/times of data >Navigation Data (l-6-77-eg.010 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197706131605300 197706161608400 >197706161614000 197706180013300 >197706180041300 197706180212000 >197706180220000 197706180220000 >197706180228000 197706180228000 >197706180236000 197706180236000 >197706180244000 197706180244000 >197706180254000 197706180254000 >197706180302000 197706180302000 >197706180310000 197706180310000 >197706180318000 197706180318000 >197706180326000 197706180326000 >197706180334000 197706180334000 >197706180342000 197706180342000 >197706180350000 197706180350000 >197706180358000 197706180358000 >197706180406000 197706180406000 >197706180430000 197706180430000 >197706180440000 197706180444000 >197706180458000 197706181218000 >197706181248300 197706202148000 >197706202214000 197706202214000 >197706202244000 197706202244000 >197706202254000 197706202254000 >197706202320000 197706202320000 >197706202336000 197706202336000 >197706202352000 197706202352000 >197706210018000 197706210018000 >197706210026000 197706210026000 >197706210036000 197706210036000 >197706210102000 197706210102000 >197706210118000 197706210118000 >197706210126000 197706210126000 >197706210134000 197706210134000 >197706210206000 197706210206000 >197706210232000 197706210232000 >197706210250000 197706210250000 >197706210306000 197706210306000 >197706210332000 197706210332000 >197706210404000 197706210404000 >197706210446000 197706210446000 >197706210502000 197706210502000 >197706210538000 197706210538000 >197706210602000 197706210602000 >197706210634000 197706210634000 >197706210708000 197706210708000 >197706210734000 197706210734000 >197706210818000 197706210818000 >197706210826000 197706210826000 >197706210844000 197706210844000 >197706210902000 197706210902000 >197706210920000 197706210920000 >197706210938000 197706210938000 >197706211012000 197706211012000 >197706211020000 197706211020000 >197706211044000 197706211044000 >197706211110000 197706211110000 >197706211128000 197706211128000 >197706211144000 197706211144000 >197706211204000 197706211204000 >197706211230000 197706211230000 >197706211256000 197706211256000 >197706211314000 197706211314000 >197706211330000 197706211330000 >197706211348000 197706211348000 >197706211404000 197706211404000 >197706211420000 197706211420000 >197706211428000 197706211428000 >197706211456000 197706211456000 >197706211504000 197706211504000 >197706211538000 197706211538000 >197706211546000 197706211546000 >197706211602000 197706211602000 >197706211618000 197706211618000 >197706211634000 197706211634000 >197706211706000 197706211706000 >197706211732000 197706211732000 >197706211748000 197706211748000 >197706211814000 197706211814000 >197706211822000 197706211822000 >197706211846000 197706211846000 >197706211912000 197706211912000 >197706211936000 197706211936000 >197706212002000 197706212002000 >197706212024000 197706212024000 >197706212038000 197706212038000 >197706212104000 197706212104000 >197706212128000 197706212128000 >197706212146000 197706220300000 >197706220350000 197706231704500 >197706231715300 197706242343400 >197706250026000 197706261727200 >197706261757000 197706261935500 >197706262007100 197706271649300 >197706271658000 197706280144000 >197706280201100 197706281149500 >197706281231300 197706281246500 >197706281310300 197706290830400 >197706290859000 197706291118200 >197706291124200 197706291720400 >197706291734200 197706291959400 >197706292012000 197706301038200 >197706301051400 197706301348000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-6-77-eg.165_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197706131804420 197706132011120 >197706132034120 197706140125180 >197706140135180 197706141104000 >197706141158000 197706141335000 >197706141353000 197706142157120 >197706142221120 197706150251120 >197706150314120 197706150513180 >197706150532180 197706150709180 >197706150738180 197706160053180 >197706160120180 197706160251180 >197706160325180 197706161603180 >197706161609000 197706162319000 >197706162340000 197706170113000 >197706170132000 197706171136000 >197706171212000 197706180008120 >197706180036300 197706180203300 >197706180504000 197706180947180 >197706181147180 197706181213180 >197706181235300 197706181823300 >197706181847300 197706191344300 >197706191554300 197706191837300 >197706192011300 197706200452300 >197706200653300 197706201447300 >197706201607300 197706202156420 >197706212022180 197706220458300 >197706220517300 197706220725420 >197706220749420 197706220901420 >197706220924420 197706221414420 >197706221439420 197706230656480 >197706230706480 197706230826480 >197706230835480 197706230936480 >197706230947480 197706231631480 >197706231710300 197706231954420 >197706232101420 197706232151420 >197706232305420 197706240535420 >197706240619180 197706241016180 >197706241201180 197706241810180 >197706241827180 197706250455180 >197706250622180 197706250720180 >197706250805180 197706251337180 >197706251435180 197706251556180 >197706251707180 197706252241180 >197706252255180 197706260001180 >197706260040180 197706260203180 >197706260242180 197706260716180 >197706261104180 197706261358180 >197706262022120 197706270433120 >197706270454120 197706270954120 >197706271103120 197706271629120 >197706271701000 197706271935000 >197706271945000 197706280139000 >197706280151480 197706280811480 >197706281426480 197706281701480 >197706281720480 197706281826480 >197706281845480 197706282053180 >197706282105180 197706282253180 >197706282322180 197706290122180 >197706290134180 197706290335180 >197706290355180 197706290619180 >197706290654180 197706290817180 >197706290853420 197706291453420 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-6-77-eg.260_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197706131812300 197706142220560 >197706150256410 197706162108360 >197706162341440 197706181953250 >197706182004090 197706182005330 >197706182012550 197706191314580 >197706200003110 197706200307030 >197706200919480 197706202145560 >197706202210460 197706202314190 >197706211858360 197706230447270 >197706230458430 197706230550190 >197706231033230 197706240511360 >197706240522540 197706241533540 >197706250546460 197706251755240 >197706271659420 197706280555040 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-6-77-eg.335_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197706140344000 197706142317060 >197706142343000 197706150417000 >197706150530540 197706150745240 >197706150800000 197706160641300 >197706160706420 197706171203060 >197706171222240 197706171235000 >197706171259060 197706181022000 >197706181100000 197706181816540 >197706181827480 197706190301120 >197706190320540 197706190412120 >197706190434480 197706191245120 >197706191314420 197706200924000 >197706200950480 197706211404180 >197706211506240 197706222050300 >197706222122360 197706222325300 >197706222337120 197706230517180 >197706230536000 197706230802360 >197706230815360 197706230937420 >197706230948180 197706231207060 >197706231223480 197706240347240 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  5. How consistent are the relationships among the observations, including topology?
    This data set is from one field activity with unknown instrument calibrations. Processed bathymetric depths were spot checked based on latitude and longitude against the Global Multi-Resolution Topography (GMRT) grid within GeoMapApp to ensure reasonable values.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
This information is not intended for navigational purposes. Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data. Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    345 Middlefield Road MS 999
    Menlo Park, CA
    USA

    (650) 329-5078 (voice)
    (650) 329-5190 (FAX)
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 01-Feb-2017
Metadata author:
Gregory K. Miller
U.S. Geological Survey
Physical Scientist
U.S. Geological Survey, 600 Fourth Street South
St. Petersburg, FL
USA

(727) 803-8747, ext. 3020 (voice)
gmiller@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/865.faq.html>
Generated by mp version 2.9.49 on Mon Sep 10 17:43:21 2018